Adding money in different ways

Key Stage 1

Maths

Money

I want to buy an apple that costs 20p. What coin should I give the shopkeeper?

I buy a rubber for 60p. I paid with a £1 coin. How much change would I receive?

﻿Hello everyone, and welcome to maths with Ms.Dobrowolski. In today's lesson, we'll be learning how to add money in different ways. Here is the lesson agenda for today. First, we'll be reviewing our coins and our notes, then, we'll be making amounts with coins, then, we'll be making amounts with coins and notes, and finally, you'll be off for your independent task. For this lesson, you will need a pencil and a notebook or something to write on. You might also want some coins or notes, but make sure you ask an adult to help you get these. If you don't have any coins or notes, that's completely fine. They are not necessary for you to be successful in this lesson. However, if you don't have a pencil or a notebook, pause the video now and go get these items. Great. So, let's review our coins and notes. My turn, your turn. One penny, two pence, five pence, 10 pence, 20 pence, 50 pence, one pound, two pounds, five pounds, 10 pounds, 20 pounds, 50 pounds. Well done everyone. So, I have some coins on my screen and I want to combine them to make an amount of money. I have 20 pence plus five pence. Well, I know that 20 plus five is equal to 25. I can also help to add these... I can also add these numbers by using a bead string to help me. So, for example, here is my bead string, let's make 20, count with me. One, two, three, four, five, six, seven, eight, nine, 10 11, 12, 13, 14, 15, 16, 17, 18, 19, 20. So that's 20, and now I need another five, one, two, three, four, five. So, if I know this is 20, I can just count on, 21, 22, 23, 24 and 25. Good. What other coins could you use to make the same amount? So, if I wanted to make 25P and I didn't have a 20P coin, how else could I do it? Well, watch and look at what I do. So, I know I want to make 25 pence, I've already done that using a 20 pence coin, and a five pence coin. How else can I make 25 pence? Well, I know that the number 20 is in the 10 times table, because when I skip count by tens, I say 20, 10, 20. So, I could use two 10 pence coins to make 20. So, 10, 20. How much more do I need to make 25? Oh, I could just use a five pence coin. 10, 20, 25. I could use two 10 pence coins, and one five pence coin. Another way I could do this, is I could say, "Oh, I know that when I skip count by fives, I will say the number 25, because there is a five in the ones place. Five, 10, 15, 20, 25. So, I could use my five pence coins, you can skip count with me. Five, 10, 15, 20, 25. I could use one, two, three, four, five, five pence coins to make 25 pence. So, here are three different ways to make 25 pence. Great. So, let's try that again with another amount. So, when I add my coins, I know that I always want to start with my greatest value coins, and then I want to make sure that I'm adding similar coins together first. So, it looks like the coin with the greatest value here is 20 pence, and I have two of those. So, I'll make sure to add those two together first. So, you can add with me. 20P plus 20P is equal to 40P. 40P plus 5P is equal to 45P, and 45 plus 2P is equal to 47P. Great. So, I wonder, what other coins could you use to make the same amounts? Instead of watching me first, I would like for you to pause the video, and have a go at this, and make 47P using a different set of coins. Now, if you don't have coins, that's completely fine. What you can do, is just write the different amounts. So, for example, you might write 10P plus 10P and keep going from there to see if you can make 47P. Remember to only use the values, of the coins that really exist. For example, you can't add 3P, because there is no 3P coin. So, if you're not sure, make sure you go back and look at the beginning of this video, where we review our coins and notes. But for now, pause the video and have a go. What other coins could you use, to make the same amount 47P? Great. So let's see what other amounts you came up with, and let's see what I came up with. So, here was my original set of coins to make 47P. I had two 20P coins, of 5P coin and a 2P coin. When I went to make my other amounts, I realised, Oh, 40 will be in the 10 times table, because I can skip count by tens to make 40. 10, 20, 30, 40. So, I'm going to use my 10 pence coins, count with me. 10, 20, 30, 40. So, since I've got my 40 here, I only need seven more to make 47. Well, I know that I have some 2P coins here, so I can go, 42, 44, 46, and then I just need one more, so I'm going to use my 1P coin, and 47. So, let's count that again altogether. 10, 20, 30, 40, and here are my twos, 42, 44, 46, 47. Let's try this again. So, here I have some more coins. Let's figure out how much money I have. So, I'll start with my greatest value first, which it looks like here's two pounds. So, two add one is three, three add one is four, and four add one is five. So I have five pounds. Your turn. What other coins could you use to make the same amount? How can you make five pounds? Pause the video, have a go, and then come back to have a look at what I came up with. Great. So, hopefully you've come up with some different amounts and we can compare and see, did you come up with the strategies that I came up with? So, here was my original set of coins, two, a two pound coin, plus three one pound coins. Two, three, four, five is equal to five pounds. Another way I could have done this, was, I could have had a two pound coin plus a two pound coin, which is equal to four, and then four plus one pound is equal to five. Two, four, five, five pounds. There was also one more way I could have done this. Well, actually there was a lot of ways, but this is the one I came up with. So, I started with my one pound coins, count with me one, two, three, four, and when I got to four pounds, I did something that I thought was a bit clever. I know that 50P and 50P make a 100P or one pound. So, this 50P and this 50P are equal to one pound. So, let's look at that again. One pound, two pound, three pound four pound and five pound. So, here I've made five pound using pounds and pence. So, well done everyone, let's try creating an amount of money one more time, but this time I've made it a bit trickier by including a note instead of just coins. But that's because you're also clever, and I know you can do this. So, first, let's see how much money I have on the screen. So again, when we count our money, we always start with the greatest value coins or note first. So, here I have a five pound note, which seems to be the greatest value note. So, let's start. Five pound plus two pound is equal to seven pound, and seven pound plus one pound is equal to eight pounds. So, your turn. What other coins or notes, could you use to make this same amount? So, your turn. Pause the video, see if you can make eight pounds using a different set of coins or notes. Great. So here is my eight pounds that I used originally. So I had a five pound note, a two pound coin and a one pound coin. I'm sure you all came up with very clever ways to make eight pounds. So let's see if you're thinking matched mine. So, I thought to myself, Oh, eight, I come across eight when I skip count by twos, two, four, six, eight. And I know that I have two pound coins, so, I'm going to use my two pound coins. Skip count with me by twos, and let's see if I'm correct. Two, four, six, eight. Excellent. So, I can use one, two, three, four, two pound coins to make eight pounds. I could also do this. I started with my five pound note, so I know I had five pounds. Then, I simply used one pound coins until I reached eight. So I started with five, then I had six, seven, eight pounds. So, I could use the five pound note and three one pound coins to make eight pounds. Great. Let's try something a little bit different now. I have an empty purse here, and I'm going off to the shop to buy some apples. I know that my apples will cost 65 pence. So, which coins could I use to make 65 pence, so, that when I get to the shop, I have an exact amount in my purse? Well, I'm going to work systematically, by starting with coins with the greatest value first. So, here's my 50 pence coin, that I'm going to drop into my purse. Can I add another 50 pence coin? Well, 50 plus 50 is equal to a hundred pence, or one pound, and that's too much. I only need 65 pence. So let's see if I can put in a coin that has lesser value. Here's my 20 pence coin. 50 plus 20 is equal to 70. That's too much, I only need 65 pence. Let's go to a coin with even lesser value, the 10 pence coin. 50 plus 10 is equal to 60. So, I'm going to take that coin and drop it in. 50 plus 10 is equal to 60. How much more do I need? I have 60 and I only need 65 pence. So, I can drop my five pence coin in there, and now I have 65 pence. Those are the coins I'm going to take to the shop. Well, I have a little mystery for you to solve now. I have 29 pound in my purse, but you can't see what's inside my purse, because it's closed. Which coins and notes might I have? Well, we can also solve this systematically, by starting with the note or coin with the greatest value. So, I know I have 29 pounds in my purse, I can drop a 20 pound note in there. Can I drop a 10 pound note? Well, 20 plus 10 is equal to 30 and I only have 29 pounds, so this is too much. 20 plus five is equal to 25, so I can drop a five pound note. Can I drop another five pound note? 25 plus five is equal to 30, I can't use another five pounds so that's too much. What about a two pound coin? 25 plus two is equal to 27, and 27, plus another two is equal to 29. So, in my purse, I could possibly have a 20 pound note, a five pound note and two, two pound coins. So, why don't you pause the video, and have another guess? What other coins or notes might I have, if I have 29 pounds in my purse? Can you make 29 using a different set of coins and notes? Wow, it's already time for your independent task. Now, for your independent task, make sure you're using the mathematical language. So, the sentences that I've put here, when you're working out how to complete this task. Of course, as usual, let's do one together, so we're all on the same page. For this independent task, you will have to work out, what coins or notes you will need in order to pay for these items. So, I choose the kettle that costs 59 pounds. I know that 50, plus five, plus four is equal to 59 So, I will use a 50 pound note, a five pound note, and one, two, three, four, one pound coins, to make 59 pounds. Now, it's your turn to work out which coins and notes, you will need to make each value. Make sure you are using values that actually exist. So for example, there's no such thing as a three pound coin, so you can not use that when adding your coins and notes. Also, make sure you're paying attention, to whether the values are in pounds or pence. If it's in pence, you'll have to make sure you're using your pence and your coins. Okay. Your turn, pause the video, and when you're finished, make sure to resume so we can go over the answers. Well done everyone. I'm sure you realise that there were many options, for making these amounts. For example, for the toaster, I saw I chose the toaster that costs 19 pounds, and I know that 10 pounds plus five pounds, plus four one pound coins, are equal to 19 pounds. For the ball, I simply used four one pound coins, to make four pounds. For the ice cream that costs 81 pence, I used the 50 pounds pence coin, plus a 20 pence coin, a 10 pence coin and a one pence coin. For the pencil that costs 13 pence, I used a 10 pence coin, and one to two, three, one pence coins. And for the rubber that costs 74 pence, I used a 50 pence, a 20 pence, and one, two, three, four pence coins. However, you might have worked this out differently. It would be really helpful, If you can ask a parent or carer to double check your work, to make sure that the combinations you came up with were correct. And as always, if you'd liked to, you can share your work with Oak National, by asking your parents or carer to share your work on Twitter, tagging @OakNational and #LearnwithOak. I think it'd be really amazing to see what combinations you came up with for this independent task. As always, don't forget to complete your quiz. It was really nice to see all of you, and I hope to see you for future lessons. Bye now.

Adding money in different ways

Adding money in different ways

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UnitMaths / Money

Maths